Uberlingen mid air disaster.

in july 1st of 2002. A boeing 757-200 a DHL cargo jet and A tu-154 carrying children on board for a school trip ATC had made an mistake about to asking the tu-154 to decend but the TCAS system asked them to climb but. The pilots of the tu-154 listened to the ATC and Decended meanwhile they did not know about the DHL 757-200 decending too. Listening to the TCAS and they didn't know about it until it was too late. RIP to people who were onboard [it doesnt respawn so you have to rejoin to respawn]